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MAC address not unique on ABIT MB

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July 20, 2005 10:28:41 AM

I recently bought an ABIT Fatal1ty MB and was not able to get an IP address from my ISPs DHCP. The reason was that the MAC address of the onboard NIC was already in use somewhere in my ISPs network, so they could not give me an IP address.
A little more research by the support guy showed that the MAC address had been used in several places and in several countries. And that only in my ISPs network!
I wonder, have anyone else with an ABIT board had this problem?
Anonymous
a b V Motherboard
July 20, 2005 3:06:50 PM

Omg if thats true that is reallly suprising. Its actually illegal to have a Mac addresse duplicated!

You sure he wasnt giving you BS because I think we would have heard from this...

Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0
July 20, 2005 3:09:12 PM

I'm sure since he read the MAC address and I confirmed that that was mine...

I recall that the very first time I powered up my MB it said that the CRC of the bios was corrupted and that it would start from a fresh one. Maybe that is the root cause for all this?
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Anonymous
a b V Motherboard
July 20, 2005 3:49:37 PM

Not really since the Mac address is "burnt in" the NIC.
The Mac adress should be in a ROM chip directly on the LAN card.
Altough the Corrupted CRC for bios is not exactly good.

That might be one of the reason Abit is having trouble lately!


Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0
July 20, 2005 3:53:06 PM

The NIC is on the MB in this case, so maybe it shares NVRAM with the BIOS?
July 20, 2005 4:34:36 PM

Did you try contacting Abit, either for a fix or a RMA.

<b><font color=blue>If you try to please everybody, nobody will like you<font color=blue></b>
July 20, 2005 5:20:07 PM

Yes, I contacted their support immediately. They said they would get back to me. This was weeks ago.
Anonymous
a b V Motherboard
July 20, 2005 6:57:09 PM

Well NVRam can be written or erase, so its almsot cetrainly residing on the NIC...

Push the suppor tharder!! heh

Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0
July 21, 2005 3:46:37 PM

ipconfig /all

Mike.

<font color=blue>Outside of a dog, a book is man's best friend. Inside the dog its too dark to read.
-- Groucho Marx</font color=blue>
July 21, 2005 5:13:06 PM

i just bought an abit board but i havent had any problems.

of course i use dhcp off of a broadband router.. i think the only MAC that gets sent to my ISP is the one off the cable modem

My PC:
Abit AX8 Socket 939 VIA K8T890
AMD Athlon 64 3200 Winchester
Sapphire Radeon X700 Pro 256 Mb PCIe
WD Raptor 37 Gb SATA
Corsair 2x512 PC3200 DDR Dual-Channel Platnium Edition
Anonymous
a b V Motherboard
July 21, 2005 5:47:53 PM

Just emebr a feature after reading the last post.
Most Router have a clone mac adress to use with ISP that rely on that like yours...that might have a link with these problem...
Because I still find it quite amazing that there's the same MAC adress on their net!

Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0
July 21, 2005 6:29:12 PM

yeah MAC addresses are controlled strictly by the manufacturers of Network cards... if they put the same MAC on several Network chips then they are in for some big trouble..

the only other options is that a bunch of people got a hold of that mac and are spoofing it to hack into things
it could be just with that series of motheboards too. Maybe somehow the company that made the boards didnt flash the Network chips properly.

My PC:
Abit AX8 Socket 939 VIA K8T890
AMD Athlon 64 3200 Winchester
Sapphire Radeon X700 Pro 256 Mb PCIe
WD Raptor 37 Gb SATA
Corsair 2x512 PC3200 DDR Dual-Channel Platnium Edition
Anonymous
a b V Motherboard
July 21, 2005 6:33:06 PM

It is really wasy to spoff a mac adress but to physically have the same one is almsot impossible. And its not even "flashed" it written in a ROM chip...guess you could use flashed but not exactly appropriate IMO.

Bottom line is yeah its f***** up heh


Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0
July 22, 2005 4:13:25 AM

It doesn't necesarily mean that the mobo's mac address isn't "unique". It is possible to change the mac address on most routers. It is possible that some people decided to change the router's address. Considering how we choose numbers, I wouldn't be too suprized if more than one person picked the same combination, at random.
July 22, 2005 12:16:14 PM

MAC addresses are supposed to be unique as they come from the factory. And to my knowledge its not easy to just up and change the MAC address.

The only time i have heard of someone changing their MAC is when they get a broadband router and you clone the address as mentioned before...you still have to be plugged into the card that has that MAC. Thats the only real legitamate reason to change it outside of spoofing (generally for hacking purposes)

My PC:
Abit AX8 Socket 939 VIA K8T890
AMD Athlon 64 3200 Winchester
Sapphire Radeon X700 Pro 256 Mb PCIe
WD Raptor 37 Gb SATA
Corsair 2x512 PC3200 DDR Dual-Channel Platnium Edition
July 23, 2005 3:58:39 AM

Where is it written to be "illegal" You cant have two identical mac address on the same network segment. But you can on two different network segments. I am cisco certified and that is straight out of the book.
July 25, 2005 12:17:24 PM

Why would they burn MAC addresses into devices if you could just use the same one over and over? Everywhere I have looked states that a MAC address uniquely identifies a device. If every device is unique then there shouldnt be duplicates.

Plus generally the only reason you would want to change your MAC address is to hack something and not make it traceable back to yourself.

My PC:
Abit AX8 Socket 939 VIA K8T890
AMD Athlon 64 3200 Winchester
Sapphire Radeon X700 Pro 256 Mb PCIe
WD Raptor 37 Gb SATA
Corsair 2x512 PC3200 DDR Dual-Channel Platnium Edition
Anonymous
a b V Motherboard
July 25, 2005 1:16:48 PM

It is illegal for vendors to use it more than once, it should'nt happen.
Im certified cisco also(only CCNA but hey! you would have mentionned it if you where CCIE =Þ) and yes there's no problem as long as you dont have them on the same segment. But by definition a MAC adress should be unique, thats the bottom line!

Asus P4P800DX, P4C 2.6ghz@3.25ghz, 2X512 OCZ PC4000 3-4-4-8, MSI 6800Ultra stock, 2X30gig Raid0
July 26, 2005 12:15:35 PM

How is that possible?? MAC address (for network anyway) are controlled by the card vendors. USB devices use MAC addresses to but they are still burned into the device.

My PC:
Abit AX8 Socket 939 VIA K8T890
AMD Athlon 64 3200 Winchester
Sapphire Radeon X700 Pro 256 Mb PCIe
WD Raptor 37 Gb SATA
Corsair 2x512 PC3200 DDR Dual-Channel Platnium Edition
!